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<?php//单分支$age = 20;if ($age >= 18) {echo "用户已成年<br>";}//双分支$age = 15;if ($age >= 18) {echo "用户已成年<br>";} else {echo "用户未成年<br>";}//三元表达式$age = 25;echo ($age >= 15) ? "用户已成年<br>" : "用户未成年<br>";//多分支$age = 35;if ($age <= 18) {echo "用户未成年<br>";} else if ($age >= 18 && $age <= 30) {echo "用户已成年,每天适当游戏时间<br>";} else {echo "用户已成年,合理安排游戏时间<br>";};//多分支的语法糖$age = 28;switch (true) {case $age <= 18:"用户未成年<br>";break;case $age >= 18 && $age <= 30:echo "用户已成年,每天适当游戏时间<br>";break;default:echo "用户已成年,合理安排游戏时间<br>";break;}echo "<hr>";//循环$colors = ['red', 'green', 'blue'];//初始化循环变量$i = 0;//设置循环条件while ($i < count($colors)) {echo $colors[$i] . "<br>";//更新循环条件$i = $i + 1;}//循环语法糖forfor ($i = 0; $i < count($colors); $i++) {echo $colors[$i] . "<br>";}echo "<hr>";//中断或跳过某次循环$colors = ['red', 'green', 'blue', 'red', 'green', 'blue'];for ($i = 0; $i < count($colors); $i++) {//只输出前五个if ($i > 4) break;//跳过第二个if ($i === 1) continue;echo $colors[$i] . "<br>";}
<?php$stus = [['id' => 1, 'name' => '刘备', 'course' => 'js', 'score' => 83],['id' => 2, 'name' => '关羽', 'course' => 'php', 'score' => 75],['id' => 3, 'name' => '张飞', 'course' => 'js', 'score' => 52],['id' => 4, 'name' => '孙权', 'course' => 'php', 'score' => 88],['id' => 5, 'name' => '周瑜', 'course' => 'js', 'score' => 65],['id' => 6, 'name' => '孔明', 'course' => 'php', 'score' => 53],['id' => 7, 'name' => '赵云', 'course' => 'js', 'score' => 63],['id' => 8, 'name' => '马超', 'course' => 'js', 'score' => 77],['id' => 9, 'name' => '姜维', 'course' => 'php', 'score' => 93],['id' => 10, 'name' => '黄忠', 'course' => 'js', 'score' => 81],]?><!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>php模板语法与html混编技巧</title><style>table {border-collapse: collapse;border: 1px solid black;text-align: center;width: 400px;margin: 0 auto;}table th,table td {border: 1px solid black;}.js_course {background-color: darkcyan;}.php_course {background-color: burlywood;}.un_score {background-color: red;color: white;}</style></head><body><table><caption>学习成绩表</caption><thead><th>ID</th><th>姓名</th><th>课程</th><th>分数</th></thead><tbody><!-- 数组的遍历,foreach(数组 as 键名 =>值){...} --><?php foreach ($stus as $stu) : ?><tr><!-- <?php echo "123" ?> 简化为 <?= "123" ?> --><td><?= $stu["id"] ?></td><td><?= $stu["name"] ?></td><?php $course_type = ($stu["course"] === "js") ? "js_course" : "php_course" ?><td class=<?= $course_type ?>><?= $stu["course"] ?></td><?php $score_type = ($stu["score"] < 60) ? "un_score" : "" ?><td class=<?= $score_type ?>><?= $stu["score"] ?></td></tr><?php endforeach ?></tbody></table></body></html>